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The notebooks in this series cover the years 1870-1880. All but two relate to Edison's work in Newark (1870-1877). The Newark books consist primarily of experimental notes and drawings on telegraphy. There are also mechanics' drawings for the production of telegraph equipment at the Newark shops, miscellaneous financial records, and documents relating to the telegraph industry. Among the latter are newspaper clippings on business and technological matters, forms used by the telegraph companies, and price lists and advertising materials. These books also contain some material on the electric pen, etheric force, and other electrical technologies. The final two books in this series date from the Menlo Park period. One consists of pasted-in notes and drawings on electric lighting covering the period October 1877 - December 1880. The other contains notes and acoustic recordings from an investigation of noise on the Metropolitan Elevated Railroad during the summer of 1878, along with notes and drawings of the aurophone and megaphone.